N.C. Gen. Stat. § 106-267.2

The Commissioner of Agriculture shall establish and promulgate rules and regulations not inconsistent with this Article that shall govern the granting of licenses under this Article and shall establish and promulgate rules and regulations not inconsistent with this Article that shall govern the manner of testing, including, but not in limitation thereof, the taking of samples, location where the testing of said samples shall be made and the length of time samples of milk or cream shall be held after testing.